Abstract
XMM-Newton observations of the outskirts of the Coma cluster of galaxies confirm the existence of warm X-ray gas claimed previously and provide a robust estimate of its temperature (~ 0.2 keV) and oxygen abundance (~ 0.1 solar). Associating this emission with a 20 Mpc infall region in front of Coma, seen in the skewness of its galaxy velocity distribution, yields an estimate of the density of the warm gas of ~ 50 Pcritical . Our measurements of gas mass associated with the warm emission strongly support its nonvirialized nature, suggesting that we are observing the warm-hot intergalactic medium (WHIM). Our measurements provide a direct estimate of the O, Ne and Fe abundance of the WHIM. Differences with the reported Ne/O ratio for some OVI absorbers hints to different origin of the OVI absorbers and the Coma filament.
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© 2004 Springer Science+Business Media Dordrecht
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Finoguenov, A., Briel, U.G., Henry, J.P. (2004). XMM-Newton Discovery of an X-Ray Filament in Coma. In: Lieu, R., Mittaz, J. (eds) Soft X-Ray Emission from Clusters of Galaxies and Related Phenomena. Astrophysics and Space Science Library, vol 309. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-2564-8_6
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DOI: https://doi.org/10.1007/978-1-4020-2564-8_6
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